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@@ -0,0 +1,295 @@
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+/* RISCV ELF shared library loader suppport
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+ *
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+ * Copyright (C) 2001-2004 Erik Andersen
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+ * Copyright (C) 2024 Waldemar Brodkorb <wbx@uclibc-ng.org>
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+ *
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+ * All rights reserved.
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+ *
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+ * Redistribution and use in source and binary forms, with or without
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+ * modification, are permitted provided that the following conditions
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+ * are met:
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+ * 1. Redistributions of source code must retain the above copyright
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+ * notice, this list of conditions and the following disclaimer.
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+ * 2. The name of the above contributors may not be
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+ * used to endorse or promote products derived from this software
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+ * without specific prior written permission.
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+ *
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+ * THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS ``AS IS'' AND
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+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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+ * ARE DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE
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+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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+ * SUCH DAMAGE.
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+ */
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+
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+/* Program to load an ELF binary on a linux system, and run it.
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+ References to symbols in sharable libraries can be resolved by either
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+ an ELF sharable library or a linux style of shared library. */
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+
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+#include "ldso.h"
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+
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+extern int _dl_linux_resolve(void);
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+
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+unsigned long _dl_linux_resolver(struct elf_resolve *tpnt, int reloc_entry)
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+{
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+ ELF_RELOC *this_reloc;
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+ char *strtab;
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+ ElfW(Sym) *symtab;
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+ int symtab_index;
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+ char *rel_addr;
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+ char *new_addr;
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+ char **got_addr;
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+ ElfW(Addr) instr_addr;
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+ char *symname;
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+
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+ rel_addr = (char *)tpnt->dynamic_info[DT_JMPREL];
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+ this_reloc = (ELF_RELOC *)(rel_addr + reloc_entry);
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+ symtab_index = ELF_R_SYM(this_reloc->r_info);
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+
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+ symtab = (ElfW(Sym) *)tpnt->dynamic_info[DT_SYMTAB];
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+ strtab = (char *)tpnt->dynamic_info[DT_STRTAB];
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+ symname = strtab + symtab[symtab_index].st_name;
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+
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+ /* Address of jump instruction to fix up */
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+ instr_addr = (this_reloc->r_offset + tpnt->loadaddr);
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+ got_addr = (char **)instr_addr;
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+
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+ /* Get the address of the GOT entry */
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+ new_addr = _dl_find_hash(symname, &_dl_loaded_modules->symbol_scope, tpnt, ELF_RTYPE_CLASS_PLT, NULL);
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+ if (unlikely(!new_addr)) {
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+ _dl_dprintf(2, "%s: can't resolve symbol '%s'\n", _dl_progname, symname);
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+ _dl_exit(1);
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+ }
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+#if defined (__SUPPORT_LD_DEBUG__)
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+ if (_dl_debug_bindings) {
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+ _dl_dprintf(_dl_debug_file, "\nresolve function: %s", symname);
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+ if (_dl_debug_detail) _dl_dprintf(_dl_debug_file,
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+ "\tpatched %x ==> %x @ %x", *got_addr, new_addr, got_addr);
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+ }
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+ if (!_dl_debug_nofixups) {
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+ *got_addr = new_addr;
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+ }
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+#else
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+ *got_addr = new_addr;
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+#endif
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+ return (unsigned long)new_addr;
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+}
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+
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+static int
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+_dl_parse(struct elf_resolve *tpnt, struct r_scope_elem *scope,
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+ unsigned long rel_addr, unsigned long rel_size,
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+ int (*reloc_fnc) (struct elf_resolve *tpnt, struct r_scope_elem *scope,
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+ ELF_RELOC *rpnt, ElfW(Sym) *symtab, char *strtab))
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+{
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+ unsigned int i;
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+ char *strtab;
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+ ElfW(Sym) *symtab;
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+ ELF_RELOC *rpnt;
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+ int symtab_index;
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+
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+ /* Parse the relocation information */
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+ rpnt = (ELF_RELOC *)rel_addr;
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+ rel_size = rel_size / sizeof(ELF_RELOC);
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+
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+ symtab = (ElfW(Sym) *)tpnt->dynamic_info[DT_SYMTAB];
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+ strtab = (char *)tpnt->dynamic_info[DT_STRTAB];
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+
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+ for (i = 0; i < rel_size; i++, rpnt++) {
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+ int res;
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+
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+ symtab_index = ELF_R_SYM(rpnt->r_info);
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+
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+ debug_sym(symtab, strtab, symtab_index);
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+ debug_reloc(symtab, strtab, rpnt);
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+
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+ res = reloc_fnc(tpnt, scope, rpnt, symtab, strtab);
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+
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+ if (res==0)
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+ continue;
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+
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+ _dl_dprintf(2, "\n%s: ", _dl_progname);
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+
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+ if (symtab_index)
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+ _dl_dprintf(2, "symbol '%s': ",
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+ strtab + symtab[symtab_index].st_name);
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+
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+ if (unlikely(res < 0)) {
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+ int reloc_type = ELF_R_TYPE(rpnt->r_info);
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+ _dl_dprintf(2, "can't handle reloc type %x\n", reloc_type);
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+ _dl_exit(-res);
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+ } else if (unlikely(res > 0)) {
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+ _dl_dprintf(2, "can't resolve symbol\n");
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+ return res;
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+ }
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+ }
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+
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+ return 0;
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+}
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+
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+static int
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+_dl_do_reloc (struct elf_resolve *tpnt, struct r_scope_elem *scope,
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+ ELF_RELOC *rpnt, ElfW(Sym) *symtab, char *strtab)
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+{
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+ int reloc_type;
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+ int symtab_index;
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+ char *symname;
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+#if defined USE_TLS && USE_TLS
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+ struct elf_resolve *tls_tpnt = NULL;
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+#endif
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+ struct symbol_ref sym_ref;
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+ ElfW(Addr) *reloc_addr;
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+ ElfW(Addr) symbol_addr;
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+#if defined (__SUPPORT_LD_DEBUG__)
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+ ElfW(Addr) old_val;
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+#endif
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+
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+ reloc_addr = (ElfW(Addr)*)(tpnt->loadaddr + (unsigned long)rpnt->r_offset);
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+ reloc_type = ELF_R_TYPE(rpnt->r_info);
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+ symtab_index = ELF_R_SYM(rpnt->r_info);
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+ sym_ref.sym = &symtab[symtab_index];
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+ sym_ref.tpnt = NULL;
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+ symbol_addr = 0;
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+ symname = strtab + sym_ref.sym->st_name;
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+
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+ if (symtab_index) {
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+ symbol_addr = (ElfW(Addr))_dl_find_hash(symname, scope, tpnt,
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+ elf_machine_type_class(reloc_type), &sym_ref);
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+
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+ /*
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+ * We want to allow undefined references to weak symbols - this might
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+ * have been intentional. We should not be linking local symbols
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+ * here, so all bases should be covered.
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+ */
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+ if (unlikely (!symbol_addr &&
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+ (ELF_ST_TYPE(symtab[symtab_index].st_info) != STT_TLS) &&
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+ (ELF_ST_BIND(symtab[symtab_index].st_info) != STB_WEAK))) {
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+ return 1;
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+ }
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+ if (_dl_trace_prelink) {
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+ _dl_debug_lookup (symname, tpnt, &symtab[symtab_index],
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+ &sym_ref, elf_machine_type_class(reloc_type));
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+ }
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+#if defined USE_TLS && USE_TLS
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+ tls_tpnt = sym_ref.tpnt;
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+#endif
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+ } else {
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+ /*
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+ * Relocs against STN_UNDEF are usually treated as using a
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+ * symbol value of zero, and using the module containing the
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+ * reloc itself.
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+ */
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+ symbol_addr = sym_ref.sym->st_value;
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+#if defined USE_TLS && USE_TLS
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+ tls_tpnt = tpnt;
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+#endif
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+ }
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+
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+#if defined (__SUPPORT_LD_DEBUG__)
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+ old_val = *reloc_addr;
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+#endif
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+
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+ switch (reloc_type) {
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+ case R_RISCV_NONE:
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+ break;
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+ case R_RISCV_32: /* REL_SYMBOLIC */
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+ case R_RISCV_JUMP_SLOT: /* REL_PLT */
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+ *reloc_addr = symbol_addr + rpnt->r_addend;
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+ break;
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+ case R_RISCV_RELATIVE:
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+ *reloc_addr += tpnt->loadaddr + rpnt->r_addend;
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+ break;
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+ case R_RISCV_COPY:
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+ if (symbol_addr) {
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+ _dl_memcpy((char *)reloc_addr, (char *)symbol_addr,
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+ sym_ref.sym->st_size);
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+ }
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+ break;
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+#if defined USE_TLS && USE_TLS
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+ case R_RISCV_TLS_DTPMOD32:
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+ *reloc_addr = tls_tpnt->l_tls_modid;
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+ break;
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+ case R_RISCV_TLS_DTPREL32:
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+ *reloc_addr = symbol_addr + rpnt->r_addend;
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+ break;
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+ case R_RISCV_TLS_TPREL32:
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+ CHECK_STATIC_TLS ((struct link_map *) tls_tpnt);
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+ *reloc_addr = tls_tpnt->l_tls_offset + symbol_addr + rpnt->r_addend - TLS_TCB_SIZE;
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+ break;
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+#endif
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+ default:
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+ return -1; /*call _dl_exit(1) */
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+ }
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+
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+#if defined (__SUPPORT_LD_DEBUG__)
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+ if (_dl_debug_reloc && _dl_debug_detail) {
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+ _dl_dprintf(_dl_debug_file, "\tpatched: %x ==> %x @ %x\n",
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+ old_val, *reloc_addr, reloc_addr);
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+ }
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+#endif
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+
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+ return 0;
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+}
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+
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+#undef __RISCV_LAZY_RELOC_WORKS
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+#ifdef __RISCV_LAZY_RELOC_WORKS
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+static int
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+_dl_do_lazy_reloc (struct elf_resolve *tpnt, struct r_scope_elem *scope,
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+ ELF_RELOC *rpnt, ElfW(Sym) *symtab, char *strtab)
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+{
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+ int reloc_type;
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+ ElfW(Addr) *reloc_addr;
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+#if defined (__SUPPORT_LD_DEBUG__)
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+ ElfW(Addr) old_val;
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+#endif
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+
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+ (void)scope;
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+ (void)strtab;
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+
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+ reloc_addr = (ElfW(Addr)*)(tpnt->loadaddr + rpnt->r_offset);
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+ reloc_type = ELF_R_TYPE(rpnt->r_info);
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+
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+#if defined (__SUPPORT_LD_DEBUG__)
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+ old_val = *reloc_addr;
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+#endif
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+
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+ switch (reloc_type) {
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+ case R_RISCV_NONE:
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+ break;
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+ case R_RISCV_JUMP_SLOT:
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+ break;
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+ default:
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+ return -1; /*call _dl_exit(1) */
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+ }
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+
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+#if defined (__SUPPORT_LD_DEBUG__)
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+ if (_dl_debug_reloc && _dl_debug_detail) {
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+ _dl_dprintf(_dl_debug_file, "\tpatched_lazy: %x ==> %x @ %x\n",
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+ old_val, *reloc_addr, reloc_addr);
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+ }
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+#endif
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+
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+ return 0;
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+}
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+#endif
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+
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+void _dl_parse_lazy_relocation_information(struct dyn_elf *rpnt,
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+ unsigned long rel_addr, unsigned long rel_size)
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+{
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+#ifdef __RISCV_LAZY_RELOC_WORKS
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+ (void)_dl_parse(rpnt->dyn, NULL, rel_addr, rel_size, _dl_do_lazy_reloc);
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+#else
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+ _dl_parse_relocation_information(rpnt, &_dl_loaded_modules->symbol_scope,
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+ rel_addr, rel_size);
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+#endif
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+}
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+
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+int _dl_parse_relocation_information(struct dyn_elf *rpnt,
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+ struct r_scope_elem *scope, unsigned long rel_addr, unsigned long rel_size)
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+{
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+ return _dl_parse(rpnt->dyn, scope, rel_addr, rel_size, _dl_do_reloc);
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+}
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Waldemar Brodkorb